负数被设定为不是回文数

1 #include
     
       2  3 using namespace std; 4  5 int F(int t) 6 { 7     int f = 1; 8     for (int i = 0; i < t; i++) 9         f = f * 10;10     return f;11 }12 13 bool isPalindrome(int x) 14 {15     int m = x;16     int L = 0;17     while (m > 0)18     {19         m = m / 10;20         L++;21     }22     int n = L / 2;23     while (n>0)24     {25         int m = F(L - 1);26         int c = x / m;27         int t = x % 10;28         if (t != c)29         {30             return false;31         }32         x = x % m;33         x = x / 10;34         L = L - 2;35         n--;36     }37     return true;38 }39 40 int main()41 {42     cout << isPalindrome(2321);43 }